package com.example.ktpspringboot.utils;

import com.alibaba.fastjson.JSON;
import com.auth0.jwt.exceptions.AlgorithmMismatchException;
import com.auth0.jwt.exceptions.SignatureVerificationException;
import com.auth0.jwt.exceptions.TokenExpiredException;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Map;

@Component
public class LoginInterceptor implements HandlerInterceptor {


    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Map<String, Object> map = new HashMap<>();
        //令牌建议是放在请求头中，获取请求头中令牌
        String token = request.getHeader("token");
        try {
            JwtUtil.verify(token);//验证令牌
            return true;//放行请求
        } catch (SignatureVerificationException e) {
            e.printStackTrace();
            map.put("msg", "无效签名");
        } catch (TokenExpiredException e) {
            e.printStackTrace();
            map.put("msg", "token过期");
        } catch (AlgorithmMismatchException e) {
            e.printStackTrace();
            map.put("msg", "token算法不一致");
        } catch (Exception e) {
            e.printStackTrace();
            map.put("msg", "token失效");
        }
        map.put("state", false);//设置状态
        String json = JSON.toJSONString(map);
        response.setContentType("application/json;charset=UTF-8");
        response.getWriter().print(json);
        return false;

    }
}
